DT2 Readme wrote:To install your copy of Rising Son, you will want to extract the installer and run it. If your Star Wars Battlefront II folder is located in the standard install location (...Program FilesLucasArtsStar Wars Battlefront II) then the installer will automatically point to that directory and you may use the automatic install. If your Star Wars Battlefront II folder is located in some other location, you will want to browse to that folder ("Star Wars Battlefront II") and point the installer to that directory. Then you may proceed with the automatic installation.

If your BF2 is in the normal directory then the installer should handle everything.